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AP6502A Datasheet PDF : 14 Pages
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AP6502A
Pin Descriptions
Pin
Number
1
Pin
Name
BS
2
IN
3
SW
4
GND
5
FB
6
COMP
7
EN
8
SS
EP
EP
Function
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET switch.
Connect a 0.01µF or greater capacitor from SW to BS to power the high side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a
4.75V to 23V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input
to the IC. See Input Capacitor.
Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC
filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side
switch.
Ground (Connect the exposed pad to Pin 4).
Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider
connected to it from the output voltage. The feedback threshold is 0.925V. See Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network
from COMP to GND. In some cases, an additional capacitor from COMP to GND is required. See
Compensation Components.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator; low
to turn it off. Attach to IN with a 100kΩ pull up resistor for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-
start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS
floating.
EP exposed thermal pad connect to Pin 4 GND.
Functional Block Diagram
FB 5
SS 8
COMP 6
EN 7
+
-
1.1V
+
-
0.3 V
-
+
+
0.925 V
OVP
OSCILLATOR
RAMP
E
80/240 KHz CLK
+
ERROR
AMPLIFIER
-
6uA
+
2.5V
-
+
-
0.9V
EN OK
LOCKOUT
COMPARATOR
SHUTDOWN
COMPARATOR
CURRENT
SENSE
AMPLIFIER
2 IN
Logic
CURRENT
COMPARATOR
1 BS
130mΩ
3 SW
130mΩ
4 GND
disable
IN < 4.10V
IN
INTERNAL
REGULATORS
5V
Figure 3. Functional Block Diagram
AP6502A
Document number: DS35812 Rev. 4 - 2
2 of 14
www.diodes.com
August 2015
© Diodes Incorporated
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